Transmitting/receiving system and method of processing data in the transmitting/receiving system

ABSTRACT

A receiving system and a data processing method are disclosed. The receiving system includes a receiving unit, a demodulator, a first handler, and a second handler. The receiving unit receives a broadcast signal including fast information channel (FIC) data, mobile service data, and a service signaling channel, the FIC data including a field indicating that a table signaling service guide bootstrap information to the service signaling channel is included therein, and the mobile service data and the service signaling channel are packetized into an RS frame belonging to a desired ensemble. The demodulator demodulates the received broadcast signal. The first handler acquires service guide bootstrap information from the table included in the service signaling channel. And, the second handler accesses a service guide announcement channel by using the service guide bootstrap information.

This application is a continuation of U.S. patent application Ser. No.14/996,787, filed on Jan. 15, 2016, now U.S. Pat. No. 9,686,573, whichis a continuation of U.S. patent application Ser. No. 14/035,657, filedon Sep. 24, 2013, now U.S. Pat. No. 9,277,290, which is a continuationof U.S. patent application Ser. No. 12/487,095, filed on Jun. 18, 2009,now U.S. Pat. No. 8,572,648, which claims the benefit of earlier filingdate and right of priority to Korean Patent Application Nos.10-2008-0082951, filed on Aug. 25, 2008, and 10-2009-0053950, filed onJun. 17, 2009, and also claims the benefit of U.S. ProvisionalApplication No. 61/073,729, filed on Jun. 18, 2008, and 61/076,685,filed on Jun. 29, 2008, the contents of which are all herebyincorporated by reference herein in their entirety.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to a transmitting system for transmittinga digital broadcasting signal, a receiving system (or receiver) forreceiving the digital broadcasting signal transmitted from thetransmitting system, and a method of processing data in the transmittingsystem and the receiving system (or receiver).

Discussion of the Related Art

The Vestigial Sideband (VSB) transmission mode, which is adopted as thestandard for digital broadcasting in North America and the Republic ofKorea, is a system using a single carrier method. Therefore, thereceiving performance of the receiving system may be deteriorated in apoor channel environment. Particularly, since resistance to changes inchannels and noise is more highly required when using portable and/ormobile broadcast receivers, the receiving performance may be even moredeteriorated when transmitting mobile service data by the VSBtransmission mode.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed to a digital broadcastingtransmitting/receiving system and a data processing method thatsubstantially obviate one or more problems due to limitations anddisadvantages of the related art.

An object of the present invention is to provide a digital broadcastingtransmitting/receiving system and a data processing method that arehighly resistant to channel changes and noise.

Another object of the present invention is to provide a digitalbroadcast transmitting/receiving system and data processing method thatcan signal service guide information by using a fast information channel(FIC).

Another object of the present invention is to provide a digitalbroadcast transmitting/receiving system and data processing method thatcan signal service guide information by using a service signalingchannel.

A further aspect of the present invention is to provide a digitalbroadcast transmitting/receiving system and data processing method thatcan receive service guide information by using signaling information ofa FIC and signaling information of a service signaling channel.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, adata processing method in a receiving system includes the steps ofreceiving a broadcast signal including fast information channel (FIC)data, mobile service data, and a service signaling channel, the FIC dataincluding a field indicating that a table signaling service guidebootstrap information to the service signaling channel is includedtherein, and the mobile service data and the service signaling channelare packetized into an RS frame belonging to a desired ensemble,demodulating the received broadcast signal, acquiring service guidebootstrap information from the table included in the service signalingchannel, and accessing a service guide announcement channel by using theservice guide bootstrap information.

Herein, the broadcast signal may further include transmission parameterchannel (TPC) data including FIC version information, wherein the FICversion information is capable of identifying an update in the FIC data.

The data processing method may further include accessing the serviceguide announcement channel, thereby acquiring service guide managementinformation, and receiving service guide information based upon accessinformation of the service guide information included in the acquiredservice guide management information. Herein, the service guidemanagement information may include a service guide delivery descriptor(SGDD).

The FIC data may be configured of a 5-byte FIC chunk header and avariable length FIC chunk payload, and the field to indicate may beincluded in at least one of the FIC chunk header and the FIC chunkpayload. Also, the service guide bootstrap information may be signaledto a descriptor of a service map table (SMT) included in the servicesignaling channel. Furthermore, the service guide bootstrap informationmay be signaled to at least one field of a guide access table (GAT)included in the service signaling channel.

In another aspect of the present invention, a receiving system includesa receiving unit, a demodulator, a first handler, and a second handler.The receiving unit receives a broadcast signal including fastinformation channel (FIC) data, mobile service data, and a servicesignaling channel, the FIC data including a field indicating that atable signaling service guide bootstrap information to the servicesignaling channel is included therein, and the mobile service data andthe service signaling channel are packetized into an RS frame belongingto a desired ensemble. The demodulator demodulates the receivedbroadcast signal. The first handler acquires service guide bootstrapinformation from the table included in the service signaling channel.And, the second handler accesses a service guide announcement channel byusing the service guide bootstrap information.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings:

FIG. 1 illustrates a protocol stack for mobile service according to anembodiment of the present invention;

FIG. 2 illustrates an exemplary structure of a data group according tothe present invention;

FIG. 3 illustrates an RS frame according to an embodiment of the presentinvention;

FIG. 4 illustrates an example of an M/H frame structure for transmittingand receiving mobile service data according to the present invention;

FIG. 5 illustrates a data transmission structure in a physical layeraccording to an embodiment of the present invention;

FIG. 6 illustrates a hierarchical signaling structure according to anembodiment of the present invention;

FIG. 7 illustrates a syntax structure of an FIC chunk according to anembodiment of the present invention;

FIG. 8 illustrates a syntax structure of an FIC chunk header accordingto an embodiment of the present invention;

FIG. 9 illustrates a syntax structure of an FIC chunk payload accordingto an embodiment of the present invention;

FIG. 10 illustrates a syntax structure of an FIC segment headeraccording to an embodiment of the present invention;

FIG. 11 illustrates a syntax structure of a service map table (SMT)section according to an embodiment of the present invention;

FIG. 12 illustrates a syntax structure of a service guide (SG) accessdescriptor included in the SMT according to an embodiment of the presentinvention;

FIG. 13 illustrates the structure of a service guide and the co-relationbetween the FIC chunk and the SMT according to an embodiment of thepresent invention;

FIG. 14 illustrates a flow chart showing a method of receiving a serviceguide by using an FIC chunk and the SMT according to an embodiment ofthe present invention;

FIG. 15 illustrates a block diagram showing a general structure of areceiving system according to an embodiment of the present invention;and

FIG. 16 illustrates a syntax structure of a guide access table (GAT)section according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts. In addition,although the terms used in the present invention are selected fromgenerally known and used terms, some of the terms mentioned in thedescription of the present invention have been selected by the applicantat his or her discretion, the detailed meanings of which are describedin relevant parts of the description herein. Furthermore, it is requiredthat the present invention is understood, not simply by the actual termsused but by the meaning of each term lying within.

Among the terms used in the description of the present invention, mainservice data correspond to data that can be received by a fixedreceiving system and may include audio/video (A/V) data. Morespecifically, the main service data may include A/V data of highdefinition (HD) or standard definition (SD) levels and may also includediverse data types required for data broadcasting. Also, the known datacorrespond to data pre-known in accordance with a pre-arranged agreementbetween the receiving system and the transmitting system.

Additionally, among the terms used in the present invention, “M/H” (orMH) corresponds to the initials of “mobile” and “handheld” andrepresents the opposite concept of a fixed-type system. Furthermore, theM/H service data may include at least one of mobile service data, andhandheld service data, and will also be referred to as “mobile servicedata” for simplicity. Herein, the mobile service data not onlycorrespond to M/H service data but may also include any type of servicedata with mobile or portable characteristics. Therefore, the mobileservice data according to the present invention are not limited only tothe M/H service data. Also, data required for mobile service accordingto the present invention will also be referred to as “mobile servicedata” for simplicity.

The above-described mobile service data may correspond to data havinginformation, such as program execution files, stock information, and soon, and may also correspond to A/V data. Most particularly, the mobileservice data may correspond to A/V data having lower resolution andlower data rate as compared to the main service data. For example, if anA/V codec that is used for a conventional main service corresponds to aMPEG-2 codec, a MPEG-4 advanced video coding (AVC) or scalable videocoding (SVC) having better image compression efficiency may be used asthe A/V codec for the mobile service. Furthermore, any type of data maybe transmitted as the mobile service data. For example, transportprotocol expert group (TPEG) data for broadcasting real-timetransportation information may be transmitted as the main service data.

Also, a data service using the mobile service data may include weatherforecast services, traffic information services, stock informationservices, viewer participation quiz programs, real-time polls andsurveys, interactive education broadcast programs, gaming services,services providing information on synopsis, character, background music,and filming sites of soap operas or series, services providinginformation on past match scores and player profiles and achievements,and services providing information on product information and programsclassified by service, medium, time, and theme enabling purchase ordersto be processed. Herein, the present invention is not limited only tothe services mentioned above. In the present invention, the transmittingsystem provides backward compatibility in the main service data so as tobe received by the conventional receiving system. Herein, the mainservice data and the mobile service data are multiplexed to the samephysical channel and then transmitted.

In the present invention, the transmitting system provides backwardcompatibility in the main service data so as to be received by theconventional receiving system. Herein, the main service data and themobile service data are multiplexed to the same physical channel andthen transmitted.

Furthermore, the transmitting system according to the present inventionperforms additional encoding on the mobile service data and inserts thedata already known by the receiving system and transmitting system(e.g., known data), thereby transmitting the processed data.

Therefore, when using the transmitting system according to the presentinvention, the receiving system may receive the mobile service dataduring a mobile state and may also receive the mobile service data withstability despite various distortion and noise occurring within thechannel.

According to an embodiment of the present invention, the transmittingsystem and the receiving system operate two different types of datachannels: an RS frame data channel for transmitting contents and a fastinformation channel (FIC) data channel for acquisiting service.

More specifically, the present invention can signal mapping informationbetween an ensemble and a mobile service by using an FIC chunk, and candivide and transmit the FIC chunk into FIC segment units, therebyenabling a receiving system to perform quick service acquisition.

FIG. 1 illustrates a protocol stack for providing mobile services in anIP basis according to an embodiment of the present invention.

More specifically, in the transmitting system, the mobile service data(e.g., A/V steaming) are packetized based upon a real time protocol(RTP) method. The RTP packet is then packetized once again based upon auser datagram protocol (UDP) method. Thereafter, the RTP/UDP packet isin turn packetized based upon an IP method, thereby being packetizedinto RTP/UDP/IP packet data. In the description of the presentinvention, the packetized RTP/UDP/IP packet data will be referred to asan IP datagram for simplicity.

Furthermore, service information for receiving mobile services may beprovided in the form of a table. And, a service signaling channeltransmitting such tables (e.g., service map table (SMT)) is packetizedbased upon a UDP method. And, the packetized UDP data are thenpacketized based upon an IP method, thereby being packetized into UDP/IPdata. In the description of the present invention, the packetized UDP/IPpacket data will also be referred to as an IP datagram for simplicity.According to an embodiment of the present invention, the servicesignaling channel is encapsulated into an IP datagram having awell-known destination IP address and a well-known destination UDP portnumber.

According to an embodiment of the present invention, an RS frame isformed by gathering the IP datagrams in the adaptation layer, and dataof the RS frame are distributed to a plurality of data groups.Thereafter, in a mobile physical layer, the distributed data modulatedby using a predetermined transmission method, e.g., a VSB transmissionmethod, thereby transmitting the modulated data. According to theembodiment of the present invention, an FIC segment is included in eachof the data groups. The relation between the RS Frame and the FICsegment will be described in detail in a later process.

Meanwhile, a service guide delivery descriptor (SGDD) including accessinformation of announcement information for mobile services may beincluded in the RS frame so as to be transmitted. According to anembodiment of the present invention, the SGDD is transmitted through aservice guide announcement channel. According to an embodiment of thepresent invention, the service guide announcement channel is packetizedbased upon a file transfer protocol (FTP) method, a File Delivery overUnidirectional Transport (FLUTE) method. The packetized data are thenpacketized based upon an asynchronous layered coding/layered codingtransport (ALC/LCT) method. Thereafter, the packetized ALC/LCT data arein turn packetized based upon a UDP method, thereby being packetizedinto ALC/LCT/UDP packet data and included in the RS frame. Morespecifically, the RS frame may include at least one of an IP datagram ofmobile service data, an IP datagram of a service signaling channel, andan IP datagram of a service guide announcement channel.

In the description of the present invention, a collection (or group) ofconsecutive RS frames having the same forward error correction (FEC)codes will be referred to as an ensemble.

According to an embodiment of the present invention, information thatcan identify an ensemble including an entry point of a service guide(i.e., SGDD) is signaled to the FIC.

According to the embodiment of the present invention, access informationof the service guide announcement channel is signaled to the servicesignaling channel included in the ensemble identified by the FIC.

According to an embodiment of the present invention, access informationof the service guide announcement channel includes service guidebootstrap information. More specifically, the service guide bootstrapinformation corresponds to information required for bootstrapping theservice guide of a mobile service. The service guide bootstrapinformation includes access information of a FLUTE session (e.g., TSI)that transmits the service guide announcement channel.

According to the embodiment of the present invention, access informationof the service guide announcement channel is signaled through a tableincluded in the service signaling channel. The table may correspond to aservice map table (SMT) or to a guide access table (GAT). In thedescription of the present invention, the data included in the RS framewill also be referred to as mobile service data for simplicity.

Data Format Structure

Meanwhile, the data structure used in the mobile broadcasting technologyaccording to the embodiment of the present invention may include a datagroup structure and an RS frame structure, which will now be describedin detail.

FIG. 2 illustrates an exemplary structure of a data group according tothe present invention. FIG. 2 shows an example of dividing a data groupaccording to the data structure of the present invention into 10 M/Hblocks (i.e., M/H block 1 (B1) to M/H block 10 (B10)). In this example,each M/H block has the length of 16 segments. Referring to FIG. 2, onlythe RS parity data are allocated to portions of the 5 segments beforethe M/H block 1 (B1) and the 5 segments following the M/H block 10(B10). The RS parity data are excluded in regions A to D of the datagroup. More specifically, when it is assumed that one data group isdivided into regions A, B, C, and D, each M/H block may be included inany one of region A to region D depending upon the characteristic ofeach M/H block within the data group.

Herein, the data group is divided into a plurality of regions to be usedfor different purposes. More specifically, a region of the main servicedata having no interference or a very low interference level may beconsidered to have a more resistant (or stronger) receiving performanceas compared to regions having higher interference levels. Additionally,when using a system inserting and transmitting known data in the datagroup, wherein the known data are known based upon an agreement betweenthe transmitting system and the receiving system, and when consecutivelylong known data are to be periodically inserted in the mobile servicedata, the known data having a predetermined length may be periodicallyinserted in the region having no interference from the main service data(i.e., a region wherein the main service data are not mixed). However,due to interference from the main service data, it is difficult toperiodically insert known data and also to insert consecutively longknown data to a region having interference from the main service data.

In the data group, the data included in a RS frame will be referred toas “mobile service data” for simplicity. The RS frame data (or the dataof the RS frame) will be described in more detail in a later process.

Referring to FIG. 2, M/H block 4 (B4) to M/H block 7 (B7) correspond toregions without interference of the main service data. M/H block 4 (B4)to M/H block 7 (B7) within the data group shown in FIG. 2 correspond toa region where no interference from the main service data occurs. Inthis example, a long known data sequence is inserted at both thebeginning and end of each M/H block. In the description of the presentinvention, the region including M/H block 4 (B4) to M/H block 7 (B7)will be referred to as “region A (=B4+B5+B6+B7)”. As described above,when the data group includes region A having a long known data sequenceinserted at both the beginning and end of each M/H block, the receivingsystem is capable of performing equalization by using the channelinformation that can be obtained from the known data. Therefore, thestrongest equalizing performance may be yielded (or obtained) from oneof region A to region D.

In the example of the data group shown in FIG. 2, M/H block 3 (B3) andM/H block 8 (B8) correspond to a region having little interference fromthe main service data. Herein, a long known data sequence is inserted inonly one side of each M/H block B3 and B8. More specifically, due to theinterference from the main service data, a long known data sequence isinserted at the end of M/H block 3 (B3), and another long known datasequence is inserted at the beginning of M/H block 8 (B8). In thepresent invention, the region including M/H block 3 (B3) and M/H block 8(B8) will be referred to as “region B (=B3+B8)”. As described above,when the data group includes region B having a long known data sequenceinserted at only one side (beginning or end) of each M/H block, thereceiving system is capable of performing equalization by using thechannel information that can be obtained from the known data. Therefore,a stronger equalizing performance as compared to region C/D may beyielded (or obtained).

Referring to FIG. 2, M/H block 2 (B2) and M/H block 9 (B9) correspond toa region having more interference from the main service data as comparedto region B. A long known data sequence cannot be inserted in any sideof M/H block 2 (B2) and M/H block 9 (B9). Herein, the region includingM/H block 2 (B2) and M/H block 9 (B9) will be referred to as “region C(=B2+B9)”. Finally, in the example shown in FIG. 2, M/H block 1 (B1) andM/H block 10 (B10) correspond to a region having more interference fromthe main service data as compared to region C. Similarly, a long knowndata sequence cannot be inserted in any side of M/H block 1 (B1) and M/Hblock 10 (B10). Herein, the region including M/H block 1 (B1) and M/Hblock 10 (B10) will be referred to as “region D (=B1+B10)”. Since regionC/D is spaced further apart from the known data sequence, when thechannel environment undergoes frequent and abrupt changes, the receivingperformance of region C/D may be deteriorated.

Additionally, the data group includes a signaling information areawherein signaling information is assigned (or allocated). In the presentinvention, the signaling information area may start from the 1^(St)segment of the 4^(th) M/H block (B4) to a portion of the 2^(nd) segment.According to an embodiment of the present invention, the signalinginformation area for inserting signaling information may start from the1^(st) segment of the 4^(th) M/H block (B4) to a portion of the 2^(nd)segment. More specifically, 276(=207+69) bytes of the 4^(th) M/H block(B4) in each data group are assigned as the signaling information area.In other words, the signaling information area consists of 207 bytes ofthe 1^(st) segment and the first 69 bytes of the 2^(nd) segment of the4^(th) M/H block (B4). The 1^(St) segment of the 4^(th) M/H block (B4)corresponds to the 17^(th) or 173^(rd) segment of a VSB field.

Herein, the signaling data transmitted through the signaling informationarea may be identified by two different types of channel data: atransmission parameter channel (TPC) data and a fast information channel(FIC) data.

Also, the TPC data includes parameters that are mostly used in aphysical layer module. And, since the TPC data are transmitted withoutbeing interleaved, the TPC data may be accessed by slot unit in thereceiving system. The FIC data are provided in order to enable thereceiving system to perform fast service acquisition. Herein, the FICdata include cross layer information between a physical layer and anupper layer. The FIC data are interleaved in sub-frame units and thentransmitted.

For example, when the data group includes 6 known data sequences, asshown in FIG. 2, the signaling information area is located between thefirst known data sequence and the second known data sequence. Morespecifically, the first known data sequence is inserted in the last 2segments of the 3^(rd) M/H block (B3), and the second known datasequence in inserted in the 2^(nd) and 3^(rd) segments of the 4^(th) M/Hblock (B4). Furthermore, the 3^(rd) to 6^(th) known data sequences arerespectively inserted in the last 2 segments of each of the 4^(th),5^(th), 6^(th), and 7^(th) M/H blocks (B4, B5, B6, and B7). The 1^(st)and 3^(rd) to 6^(th) known data sequences are spaced apart by 16segments.

FIG. 3 illustrates an RS frame according to an embodiment of the presentinvention.

The RS frame is received for each M/H frame in a condition where thereceiving system is switched to a time-slicing mode.

The RS frame according to an embodiment of the present invention isconfigured of multiple M/H transport packets (TPs). Each M/H TP consistsof a 2-byte M/H header and a (N−2)-byte M/H payload. The M/H payload mayinclude at least one of an IP datagram of mobile service data, an IPdatagram of an SMT, and an IP datagram of an SGDD.

More specifically, one RS frame includes an IP datagram of each mobileservice data set. Also, an IP datagram of an SMT section is included ineach of the RS frames. According to an embodiment of the presentinvention, the IP datagram of the SMT or the IP datagram of a servicesignaling channel transmitting the SMT comprises a well-known IPdestination address and a well-known destination UDP port number. And,the IP datagram is included in the RS frame so as to be received.

Furthermore, an IP datagram of the SGDD may be included in the RS frame.According to an embodiment of the present invention, the accessinformation of the SGDD or the access information of the service guideannouncement channel transmitting the SGDD is signaled to the SMT. Theaccess information of the service guide announcement channel includesservice guide bootstrap information.

Three types of IP datagrams (IP datagram 1, IP datagram 2, and IPdatagram 3) are included in the RS frame shown in FIG. 3, one of thethree IP datagrams is designated for the SMT. The remaining IP datagramsmay correspond to IP datagrams of mobile service data or IP datagramsdesignated for the SGDD. In the transmitting system, RS-encoding isperformed on the RS frame in a column direction, and CRC-encoding isperformed on the RS frame in a row direction. Then, the processed RSframe is allocated to the corresponding regions within multiple datagroups, thereby being transmitted. In the description of the presentinvention, all of the data included in the RS frame will be referred toas mobile service data for simplicity.

Data Transmission Structure

FIG. 4 illustrates a structure of an M/H frame for transmitting andreceiving mobile service data according to the present invention. In theexample shown in FIG. 4, one M/H frame consists of 5 sub-frames, whereineach sub-frame includes 16 slots. In this case, the M/H frame accordingto the present invention includes 5 sub-frames and 80 slots. Also, in apacket level, one slot is configured of 156 data packets (i.e.,transport stream packets), and in a symbol level, one slot is configuredof 156 data segments. Herein, the size of one slot corresponds to onehalf (½) of a VSB field. More specifically, since one 207-byte datapacket has the same amount of data as a data segment, a data packetprior to being interleaved may also be used as a data segment. At thispoint, two VSB fields are grouped to form a VSB frame.

One VSB frame consists of 2 VSB fields (i.e., an odd field and an evenfield). Herein, each VSB field includes a field synchronization segmentand 312 data segments. The slot corresponds to a basic time unit formultiplexing the mobile service data and the main service data.

Herein, one slot may either include the mobile service data or beconfigured only of the main service data. If the first 118 data packetswithin the slot correspond to a data group, the remaining 38 datapackets become the main service data packets. In another example, whenno data group exists in a slot, the corresponding slot is configured of156 main service data packets.

Meanwhile, the data within one RS frame may be assigned either to all ofregions A/B/C/D within the corresponding data group, or to at least oneof regions A/B/C/D. In the embodiment of the present invention, the datawithin one RS frame may be assigned either to all of regions A/B/C/D, orto at least one of regions A/B and regions C/D. If the mobile servicedata are assigned to the latter case (i.e., one of regions A/B andregions C/D), the RS frame being assigned to regions A/B and the RSframe being assigned to regions C/D within the corresponding data groupare different from one another.

According to the embodiment of the present invention, the RS frame beingassigned to regions A/B within the corresponding data group will bereferred to as a “primary RS frame”, and the RS frame being assigned toregions C/D within the corresponding data group will be referred to as a“secondary RS frame”, for simplicity. Also, the primary RS frame and thesecondary RS frame form (or configure) one parade. More specifically,when the data within one RS frame are assigned either to all of regionsA/B/C/D within the corresponding data group, one parade transmits one RSframe. Conversely, when the data within one RS frame are assigned eitherto at least one of regions A/B and regions C/D, one parade may transmitup to 2 RS frames. More specifically, the RS frame mode indicateswhether a parade transmits one RS frame, or whether the parade transmitstwo RS frames. Such RS frame mode is transmitted as the TPC data. Table1 below shows an example of the RS frame mode.

TABLE 1 RS frame mode (2 bits) Description 00 There is only one primaryRS frame for all group regions 01 There are two separate RS frames.Primary RS frame for group regions A and B Secondary RS frame for groupregions C and D 10 Reserved 11 Reserved

Table 1 illustrates an example of allocating 2 bits in order to indicatethe RS frame mode. For example, referring to Table 1, when the RS framemode value is equal to ‘00’, this indicates that one parade transmitsone RS frame. And, when the RS frame mode value is equal to ‘01’, thisindicates that one parade transmits two RS frames, i.e., the primary RSframe and the secondary RS frame. More specifically, when the RS framemode value is equal to ‘01’, data of the primary RS frame for regionsA/B are assigned and transmitted to regions A/B of the correspondingdata group. Similarly, data of the secondary RS frame for regions C/Dare assigned and transmitted to regions C/D of the corresponding datagroup.

As described in the assignment of data groups, the parades are alsoassigned to be spaced as far apart from one another as possible withinthe sub-frame. Thus, the system can be capable of responding promptlyand effectively to any burst error that may occur within a sub-frame.

Furthermore, the method of assigning parades may be identically appliedto all M/H frames or differently applied to each M/H frame. According tothe embodiment of the present invention, the parades may be assigneddifferently for each M/H frame and identically for all sub-frames withinan M/H frame. More specifically, the M/H frame structure may vary by M/Hframe units. Thus, an ensemble rate may be adjusted on a more frequentand flexible basis.

That is, the concept of an M/H ensemble is applied in the embodiment ofthe present invention, thereby defining a collection (or group) ofservices. Each M/H ensemble carries the same QoS and is coded with thesame FEC code. Also, each M/H ensemble has the same unique identifier(i.e., ensemble ID) and corresponds to consecutive RS frames.

FIG. 5 illustrates a data transmission structure in a physical layeraccording to an embodiment of the present invention. More specifically,FIG. 5 shows an example of FIC data being included in each data groupand transmitted. As described above, an M/H frame for approximately0.968 seconds is divided into 5 sub-frames, wherein data groupscorresponding to multiple ensembles exist in combination within eachsub-frame. Also, the data groups corresponding to each ensemble areinterleaved in M/H frame units, so as to configure an RS frame belongingto one ensemble. In FIG. 5, 2 ensembles (wherein NoG=4 and NoG=3) existin each sub-frame. Furthermore, a predetermined portion (e.g., 37bytes/data group) of each data group is used for the purpose ofseparately delivering encoded FIC data apart from the RS frame datachannel. The FIC region assigned to each data group consists of one FICsegment. Herein, each of the FIC segments is interleaved in sub-frameunits. For example, RS-encoding and SCCC encoding processes are appliedto the RS frame data, and RS encoding and PCCC encoding processes areapplied to the FIC data. Also, as well as the FIC data, the RS encodingand PCCC encoding processes are applied to the TPC data. Morespecifically, (187+P,187)-RS encoding process is applied to the RS framedata, (51,37)-RS encoding process is applied to the FIC data, and(18,10)-RS encoding process is applied to the TPC. Herein, P is thenumber of parity bytes.

Hierarchical Signaling Structure

FIG. 6 illustrates a hierarchical signaling structure according to anembodiment of the present invention. As shown in FIG. 6, the mobilebroadcasting technology according to the embodiment of the presentinvention adopts a signaling method using FIC and SMT (Service MapTable). In the description of the present invention, the signalingstructure will be referred to as a hierarchical signaling structure.More specifically, FIG. 6 illustrates a hierarchical signaling structurethat provides data required for service acquisition through an FIC chunkand a service map table (SMT), among IP-level mobile service signalingchannels. As shown in FIG. 6, the FIC chunk uses its fastcharacteristic, so as to deliver a mapping relation between a serviceand an ensemble to the receiving system. More specifically, the FICchunk quickly locates (or finds) an ensemble that can deliver a servicerequested by the receiving system, thereby providing the receivingsystem with signaling data that can enable the receiving system toswiftly receive RS frames of a respective ensemble.

Fast Information Channel (FIC)

The receiving system according to the present invention adopts the fastinformation channel (FIC) for a faster (or swifter) access to a servicethat is currently being broadcasted.

FIG. 7 illustrates a syntax structure of an FIC chunk that maps therelation between a mobile service and an ensemble through the FIC.Herein, the FIC chunk consists of an FIC chunk header and an FIC chunkpayload.

FIG. 8 illustrates a syntax structure of an FIC chunk header accordingto an embodiment of the present invention.

Herein, the FIC chunk header signals a non-backward compatible majorprotocol version change in a corresponding FIC chunk and also signals abackward compatible minor protocol version change. Furthermore, the FICchunk header also signals the length for an extension of an FIC chunkheader, the length for an extension of an ensemble loop header, and thelength for an extension of a mobile service loop that can be generatedby a minor protocol version change.

According to an embodiment of the present invention, a receiver (orreceiving system) that can adopt the corresponding minor protocolversion change may process the corresponding extension field, whereas alegacy (or conventional) receiver that cannot adopt the correspondingminor protocol version change may skip the corresponding extension fieldby using each of the corresponding length information. For example, incase of a receiving system that can accept the corresponding minorprotocol version change, the directions given in the correspondingextension field may be known. Furthermore, the receiving system mayperform operations in accordance with the directions given in thecorresponding extension field.

According to an embodiment of the present invention, a minor protocolversion change in the FIC chunk is performed by inserting additionalfields at the respective end portion of the FIC chunk header, theensemble loop header, and the mobile service loop included in theprevious minor protocol version FIC chunk. According to an embodiment ofthe present invention, in any other case, or when the length of theadditional fields cannot be expressed (or indicated) by each extensionlength within the FIC chunk header, or when a specific field within theFIC chunk payload is missing (or cannot be found), or when the number ofbits being assigned to the corresponding field or the definition of thecorresponding field is changed (or altered), the major protocol versionof the corresponding FIC chunk is updated.

Also, the FIC chunk header signals whether the data of a correspondingFIC chink payload carry mapping information between an ensemble and amobile service within the current M/H frame, or whether the data of acorresponding FIC chink payload carry mapping information between anensemble and a mobile service within the next M/H frame. Furthermore,the FIC chunk header also signals the number of transport stream IDs ofa mobile service through which the current FIC chunk is beingtransmitted and the number of ensembles being transmitted through thecorresponding mobile service.

Furthermore, the FIC chunk header according to the present invention maysignal an identifier of the ensemble to which an electronic serviceguide (ESG) entry point (i.e., a service guide delivery descriptor(SGDD)) is transmitted. In this case, the receiving system may know (oridentify) the ensemble having the corresponding SGDD included andreceived therein.

Accordingly, for this, the FIC chunk header may include anFIC_major_protocol_version field, an FIC_minor_protocol_version field,an FIC_chunk_header_extension_length field, anensemble_loop_header_extension_length field, anM/H_service_loop_extension_length field, a current_next_indicator field,a transport_stream_id field, SG_version field, a num_ensembles field,and ESG_Entrypoint_location field.

The FIC_major_protocol_version field corresponds to a 2-bit unsignedinteger field that represents the major version level of an FIC chunksyntax. A change in the major version level shall indicate a change in anon-backward-compatible level. When the FIC_major_protocol_version fieldis updated, legacy (or conventional) receivers, which can process theprior major protocol version of an FIC chunk protocol, shall avoidprocessing the FIC chunk.

The FIC_minor_protocol_version field corresponds to a 3-bit unsignedinteger field that represents the minor version level of an FIC chunksyntax. When it is assumed that the major version level remains thesame, a change in the minor version level shall indicate a change in abackward-compatible level. More specifically, when theFIC_minor_protocol_version field is updated, legacy (or conventional)receivers, which can process the same major version of the FIC chunkprotocol, may process a portion of the FIC chunk.

The FIC_Chunk_header_extension_length field corresponds to a 3-bitunsigned integer field identifying the length of FIC chunk headerextension bytes, which are generated by the minor protocol versionupdate of the corresponding FIC chunk. Herein, the extension bytes areappended (or added) at the end of the corresponding FIC chunk header.

The ensemble_header_extension_length field corresponds to a 3-bitunsigned integer field identifying the length of the ensemble headerextension bytes, which are generated by the minor protocol versionupdate of the corresponding FIC chunk. Herein, the extension bytes areappended (or added) at the end of the corresponding ensemble loopheader.

Also, the M/H_service_loop_extension_length field corresponds to a 4-bitunsigned integer field identifying the length of the ensemble headerextension bytes, which are generated by the minor protocol versionupdate of the M/H service loop. Herein, the extension bytes are appended(or added) at the end of the corresponding M/H service loop.

For example, it is assumed that the FIC chunk includes 2 ensembles(i.e., ensemble 0 and ensemble 1) more specifically, it is assumed thattwo mobile services are transmitted through ensemble 0, and one mobileservice is transmitted through ensemble 1. At this point, when the minorprotocol version of the FIC chunk is changed, and the FIC chunk headeris expanded by 1 byte, the FIC_chunk_header_extension_length field ismarked as ‘001’. In this case, a 1-byte expansion field (i.e.,FIC_Chunk_header_extension_bytes field) is added at the end of the FICchunk header. Also, the legacy receiver skips the 1-byte expansionfield, which is added at the end of the FIC chunk header, withoutprocessing the corresponding expansion field.

Additionally, when the ensemble loop header within the FIC chunk isexpanded by 2 bytes, the ensemble_loop_header_extension_length field ismarked as ‘010’. In this case, a 2-byte expansion field (i.e.,Ensemble_loop_header_extension_bytes field) is respectively added at theend of the ensemble 0 loop header and at the end of the ensemble 1 loopheader. Also, the legacy receiver skips the 2-byte expansion fields,which are respectively added at the end of the ensemble 0 loop headerand at the end of the ensemble 1 loop header, without processing thecorresponding 2-byte expansion fields.

Furthermore, when the mobile service loop of the FIC chunk is expandedby 1 byte, the M/H_service_loop_extension_length field is marked as‘001’. In this case, a 1-byte expansion field (i.e.,M/H_service_loop_extension_bytes field) is respectively added at the endof 2 mobile service loops being transmitted through ensemble 0 loop andat the end of 1 mobile service loop being transmitted through theensemble 1 loop. And, the legacy receiver skips the 1-byte expansionfields, which are respectively added at the end of 2 mobile serviceloops being transmitted through ensemble 0 loop and at the end of 1mobile service loop being transmitted through the ensemble 1 loop,without processing the corresponding 1-byte expansion fields.

As described above, when the FIC_minor_protocol version field ischanged, a legacy (or conventional) receiver (i.e., a receiver thatcannot adopt the minor protocol version change in the corresponding FICchunk) processes the fields apart from the extension field. Thereafter,the legacy receiver uses the FIC_chunk_header_extension_length field,the ensemble_loop_header_extension_length field, and theM/H_service_loop_extension_length field, so as to skip the correspondingexpansion fields without processing the corresponding fields. When usinga receiving system that can adopt the corresponding minor protocolversion change of the FIC chunk, each length field is used to processeven the corresponding expansion field.

The current_next_indicator field corresponds to a 1-bit indicator,which, when set to ‘1’, indicates that the corresponding FIC chunk iscurrently applicable. Alternatively, when the current_next_indicatorfield is set to ‘0’, the current_next_indicator field indicates that thecorresponding FIC chunk will be applicable for the next M/H frame.Herein, when the current_next_indicator field is set to ‘0’, the mostrecent version of the FIC chunk being transmitted with thecurrent_next_indicator field set to ‘1’ shall be currently applicable.More specifically, when the current_next_indicator field value is set to‘1’, this indicates that the corresponding FIC chunk transmits thesignaling data of the current M/H frame. Further, when thecurrent_next_indicator field value is set to ‘0’, this indicates thatthe corresponding FIC chunk transmits the signaling data of the next M/Hframe. When reconfiguration occurs, wherein the mapping informationbetween the ensemble within the current M/H frame and the mobile servicediffers from the ensemble within the next M/H frame and the mobileservice, the M/H frame prior to reconfiguration is referred to as thecurrent M/H frame, and the M/H frame following reconfiguration isreferred to as the next M/H frame.

The transport_stream_id field corresponds to a 16-bit unsigned integernumber field, which serves as a label for identifying the correspondingM/H broadcast. The value of the corresponding transport_stream_id fieldshall be equal to the value of the transport_stream_id field included inthe program association table (PAT) within the MPEG-2 transport streamof a main ATSC broadcast.

The SG_version field is a 5-bit field, which indicates versioninformation of a service guide being transmitted through a physicalchannel. More specifically, the physical channel corresponds to aphysical channel to which the corresponding FIC chunk is transmitted.

The num_ensembles field corresponds to an 8-bit unsigned integer field,which indicates the number of M/H ensembles carried through thecorresponding physical transmission channel.

The ESG_EntryPoint_Location field is assigned with 8 bits. Herein, theESG_EntryPoint_Location field indicates an identifier of an ensemble(ensemble_id) to which an ESG entry point (i.e., SGDD) is transmitted.Accordingly, the receiving system may know (or identify) the ensemble inwhich the corresponding SGDD (e.g., ESG entry point) is included andreceived.

FIG. 9 illustrates an exemplary syntax structure of an FIC chunk payloadaccording to an embodiment of the present invention. For each ensemblecorresponding to the num_ensembles field value within the FIC chunkheader of FIG. 8, the FIC chunk payload includes configurationinformation of each ensemble and information on mobile services beingtransmitted through each ensemble. Furthermore, the FIC chunk payloadincludes indication information that can indicate whether or not aservice guide entry point (i.e., SGDD) exists for each ensemble. At thispoint, by using the indication information, the receiving system mayknow (or identify) whether or not a table including service guidebootstrap information is included in the service signaling channel.Herein, the table may correspond to an SMT or to a GAT.

The FIC chunk payload consists of an ensemble loop and a mobile serviceloop below the ensemble loop. The FIC chunk payload enables the receiverto determine through which ensemble a requested (or desired) mobileservice is being transmitted. (This process is performed via mappingbetween the ensemble_id field and the M/H_service_id field.) Thus, thereceiver may receive RS frames belonging to the corresponding ensemble.

In order to do so, the ensemble loop of the FIC chunk payload mayinclude an ensemble_id field, an SG_entry_point_indicator field, anSMT_version field, an and a num_M/H_services field, which arecollectively repeated as many times as the num_ensembles field value.The mobile service loop may include an MH_service_id field,MH_service_type field, a multi_ensemble_service field, anM/H_service_status field, and an SP_indicator field, which arecollectively repeated as many times as the num_M/H_services field.

The ensemble_id field corresponds to an 8-bit unsigned integer field,which indicates a unique identifier of the corresponding ensemble. Forexample, the ensemble_id field may be assigned with values within therange ‘0x00’ to ‘0x7F’. The ensemble_id field group (or associate) themobile services with the respective ensemble. Herein, it is preferablethat the value of the ensemble_id field is derived from the parade_idfield carried (or transmitted) through the TPC data. If thecorresponding ensemble is transmitted through a primary RS frame, themost significant bit is set to ‘0’, and the remaining least significantbits are used as the parade_id field value of the corresponding parade.Meanwhile, if the corresponding ensemble is transmitted through asecondary RS frame, the most significant bit is set to ‘0’, and theremaining least significant bits are used as the parade_id field valueof the corresponding parade.

The SG_entry_point_indicator field is a 1-bit field. TheSG_entry_point_indicator field indicates whether or not a service guideentry point (i.e., SGDD) exists in the corresponding ensemble. Forexample, when the value of the SG_entry_point_indicator field is equalto ‘1’, this may indicate that the SGDD is included in the correspondingensemble. And, when the value of the SG_entry_point_indicator field isequal to ‘0’, this may indicate that the SGDD is not included in thecorresponding ensemble. At this point, when the value of theSG_entry_point_indicator field is equal to ‘1’, this may indicate thataccess information of a service guide announcement channel (i.e.,service guide bootstrap information) is signaled to a service signalingchannel included in the corresponding ensemble.

Therefore, based upon the value of the SG_entry_point_indicator field,the receiving system may identify whether or not an SGDD is included inthe corresponding ensemble. More specifically, based upon the value ofthe SG_entry_point_indicator field, the receiving system may determinewhether or not a table including the service guide bootstrap informationis included in the service signaling channel. Herein, the table maycorrespond to an SMT or to a GAT.

In this example of the present invention, an ESG_EntryPoint_Locationfield is included in the FIC chunk header, and anSG_entry_point_indicator field is included in the FIC chunk payload. Atthis point, the receiving system may refer to the two field values inorder to determine the ensemble having the SGDD included therein.Alternatively, the receiving system may refer to only one of the twofield values in order to determine the ensemble having the SGDD includedtherein. According to another embodiment of the present invention, onlyone of the two fields may be included. For example, theESG_EntryPoint_Location field may be included in the FIC chunk header,whereas the SG_entry_point_indicator field may not be included in theFIC chunk payload, and vice versa.

The SMT_version field is a 5-bit field, which indicates versioninformation of the SMT data within the corresponding ensemble.

The num_M/H_services field corresponds to an 8-bit unsigned integerfield, which represents the number of M/H services carried through thecorresponding M/H ensemble.

For example, when the minor protocol version within the FIC chunk headeris changed, and when an extension field is added to the ensemble loopheader, the corresponding extension field is added immediately after thenum_M/H_services field. According to anther embodiment of the presentinvention, if the num_M/H_services field is included in the mobileservice loop, the corresponding extension field that is to be added inthe ensemble loop header is added immediately after theM/H_service_configuration_version field.

The M/H_service_id field of the mobile service loop corresponds to a16-bit unsigned integer number, which identifies the corresponding M/Hservice. The value (or number) of the M/H_service_id field shall beunique within the mobile (M/H) broadcast. When an M/H service hascomponents in multiple M/H ensembles, the set of IP streamscorresponding to the service in each ensemble shall be treated as aseparate service for signaling purposes, with the exception that theentries for the corresponding services in the FIC shall all have thesame M/H_service_id field value. Thus, the same M/H_service_id fieldvalue may appear in more than one num_ensembles loop. And, accordingly,the M/H_service_id field shall represent the overall combined service,thereby maintaining the uniqueness of the M/H_service_id field value.

The MH_service_type field is a 5-bit field, which indicates the type ofthe corresponding mobile service.

The multi_ensemble_service field corresponds to a 2-bit enumeratedfield, which identifies whether or not the corresponding M/H service iscarried through more than one M/H ensemble. Also, themulti_ensemble_service field identifies whether or not the M/H servicecan be rendered meaningfully with only a portion of the M/H servicebeing carried through the corresponding M/H ensemble.

The M/H_service_status field corresponds to a 2-bit enumerated field,which identifies the status of the corresponding M/H service. Forexample, the most significant bit of the M/H_service_status fieldindicates whether the corresponding M/H service is active (when set to‘1’) or inactive (when set to ‘0’). Furthermore, the least significantbit indicates whether the corresponding M/H service is hidden (when setto ‘1’) or not (when set to ‘0’). The SP_indicator field corresponds toa 1-bit field, which, when set to ‘1’, indicates whether or not serviceprotection is applied to at least one of the components required forproviding a significant presentation of the corresponding M/H service.

For example, when the minor protocol version of the FIC chunk is change,and if an expansion field is added to the mobile service loop, theexpansion field is added after the SP_indicator field.

Also, the FIC chunk payload may include an FIC_chunk_stuffing( ) field.Stuffing of the FIC_chunk_stuffing( ) field may exist in an FIC-Chunk,to keep the boundary of the FIC-Chunk to be aligned with the boundary ofthe last FIC-Segment among FIC segments belonging to the FIC chunk. Thelength of the stuffing is determined by how much space is left afterparsing through the entire FIC-Chunk payload preceding the stuffing.

At this point, the transmitting system (not shown) according to thepresent invention divides the FIC chunk into multiple FIC segments,thereby outputting the divided FIC segments to the receiving system inFIC segment units. The size of each FIC segment unit is 37 bytes, andeach FIC segment consists of a 2-byte FIC segment header and a 35-byteFIC segment payload. More specifically, an FIC chunk, which isconfigured of an FIC chunk header and an FIC chunk payload, is segmentedby units of 35 bytes. Also, an FIC segment is configured by adding a2-byte FIC segment header in front of each segmented 35-byte unit.

According to an embodiment of the present invention, the length of theFIC chunk payload is variable. Herein, the length of the FIC chunkvaries depending upon the number of ensembles being transmitted throughthe corresponding physical transmission channel and the number of mobileservices included in each ensemble.

Also, the FIC chunk payload may include stuffing data. In this case, thestuffing data are used for the boundary alignment of the FIC chunk andthe last FIC-Segment, among FIC segments belonging to the FIC chunk,according to the embodiment of the present invention. Accordingly, byminimizing the length of the stuffing data, unnecessary wasting of FICsegments can be reduced.

At this point, the number of stuffing data bytes being inserted in theFIC chunk can be calculated by using Equation 1 below.The number of stuffing data bytes=35−j  Equation 1

j=(5+the number of signaling data bytes being inserted in the FIC chunkpayload) mod 35

For example, when the added total length of the 5-byte header within theFIC chunk and signaling data, which is to be inserted in the payloadwithin the FIC chunk, is equal to 205 bytes, the payload of the FICchunk may include 5 bytes of stuffing data because j is equal to 30 inEquation 1. Also, the length of the FIC chunk payload including thestuffing data is equal to 210 bytes. Thereafter, the FIC chunk isdivided into 6 FIC segments, which are then transmitted. At this point,a segment number is sequentially assigned to each of the 6 FIC segmentsdivided from the FIC chunk.

Furthermore, the present invention may transmit the FIC segments dividedfrom a single FIC chunk to a single sub-frame, or may transmit thedivided FIC segments to multiple sub-frames. If the FIC chunk is dividedand transmitted to multiple sub-frames, signaling data, which arerequired even when the amount of data that are to be transmitted throughthe FIC chunk is larger than the amount of FIC segments beingtransmitted through a single sub-frame (this case corresponds to whenmultiple services having very low bit rates are being executed), may allbe transmitted through the FIC chunk.

Herein, the FIC segment numbers represent FIC segment numbers withineach FIC chunk, and not the FIC segment number within each sub-frame.Thus, the subordinate relation between the FIC chunk and the sub-framecan be eliminated, thereby reducing excessive waste of FIC segments.

Furthermore, the present invention may add a null FIC segment. Despitethe repeated transmission of the FIC chunk, and when stuffing isrequired in the corresponding M/H frame, the null FIC segment is usedfor the purpose of processing the remaining FIC segments. For example,it is assumed that TNoG is equal to ‘3’ and that the FIC chunk isdivided into 2 FIC segments. Herein, when the FIC chunk is repeatedlytransmitted through 5 sub-frames within a single M/H frame, only 2 FICsegments are transmitted through one of the 5 sub-frames (e.g., thesub-frame chronologically placed in the last order). In this case, onenull FIC segment is assigned to the corresponding sub-frame, therebybeing transmitted. More specifically, the null FIC segment is used foraligning the boundary of the FIC chunk and the boundary of the M/Hframe. At this point, since the null FIC segment is not an FIC segmentdivided from the FIC chunk, an FIC segment number is not assigned to thenull FIC segment.

In the present invention, when a single FIC chunk is divided into aplurality of FIC segments, and when the divided FIC segments areincluded in each data group of at least one sub-frame within the M/Hframe, so as to be transmitted, the corresponding FIC segments areallocated in a reversed order starting from the last sub-frame withinthe corresponding M/H frame. According to an embodiment of the presentinvention, in case a null FIC segment exists, the null FIC segment ispositioned in the sub-frame within the M/H frame, so that thecorresponding null FIC segment can be transmitted as the last (or final)segment.

At this point, in order to enable the receiving system to discard thenull FIC segment without having to process the corresponding null FICsegment, identification information that can identify (or distinguish)the null FIC segment is required.

According to an embodiment of the present invention, the presentinvention uses the FIC_type field within the header of the null FICsegment as the identification information for identifying the null FICsegment. In this embodiment, the value of the FIC_type field within thenull FIC segment header is set to ‘11’, so as to identify thecorresponding null FIC segment. More specifically, when the FIC_typefield value within the null FIC segment header is set to ‘11’ andtransmitted to the receiving system, the receiving system may discardthe payload of the FIC segment having the FIC_type field value set to‘11’ without having to process the corresponding FIC segment payload.Herein, the value ‘11’ is merely an exemplary value given to facilitateand simplify the understanding of the present invention. As long as apre-arrangement between the receiving system and the transmitting systemis established, any value that can identify the null FIC segment may begiven to the FIC_type field. Therefore, the present invention will notbe limited only to the example set presented herein. Furthermore, theidentification information that can identify the null FIC segment mayalso be indicated by using another field within the FIC segment header.

FIG. 10 illustrates an exemplary syntax structure of an FIC segmentheader according to an embodiment of the present invention. Herein, theFIC segment header may include an FIC_type field, an error_indicatorfield, an FIC_segment_num field, and an FIC_last_segment_num field. Eachfield will now be described as follows.

The FIC_type field corresponds to a 2-bit field, which, when set to ‘00’indicates that the corresponding FIC segment is carrying a portion of anFIC chunk. Alternatively, when the FIC_type field is set to ‘11’, theFIC_type field indicates that the corresponding FIC segment is a nullFIC segment, which transmits stuffing data. Herein, the remaining valuesare reserved for future use.

The error_indicator field corresponds to a 1-bit field, which indicateswhether or not an error has occurred in the corresponding FIC segmentduring transmission. Herein, the error_indicator field is set to ‘1’,when an error has occurred. And, the error_indicator field is set to‘0’, when an error does not exist (or has not occurred). Morespecifically, during the process of configuring the FIC segment, when anon-recovered error exists, the error_indicator field is set to ‘1’.More specifically, the error_indicator field enables the receivingsystem to recognize the existence (or presence) of an error within thecorresponding FIC segment.

The FIC_segment_num field corresponds to a 4-bit unsigned integer numberfield, which indicates a number of the corresponding FIC segment. Forexample, if the corresponding FIC segment is the first FIC segment ofthe FIC chunk, the value of the FIC_segment_num field shall be set to‘0x0’. Also, if the corresponding FIC segment is the second FIC segmentof the FIC chunk, the value of the FIC_segment_num field shall be set to‘0x1’. More specifically, the FIC_segment_num field shall be incrementedby one with each additional FIC segment in the FIC chunk. Herein, if theFIC chunk is divided into 4 FIC segments, the FIC_segment_num fieldvalue of the last FIC segment within the FIC chunk will be indicated as‘0x3’.

The FIC_last_segment_num field corresponds to a 4-bit unsigned integernumber field, which indicates the number of the last FIC segment (i.e.,the FIC segment having the highest FIC_segment_num field value) within acomplete FIC chunk.

In the conventional method, FIC segment numbers are sequentiallyassigned (or allocated) for each FIC segment within one sub-frame.Therefore, in this case, the last FIC segment number always matches withthe TNoG (i.e., the last FIC segment number is always equal to theTNoG). However, when using the FIC number assignment method according tothe present invention, the last FIC segment number may not always matchwith the TNoG. More specifically, the last FIC segment number may matchwith the TNoG, or the last FIC segment number may not match with theTNoG. The TNoG represents a total number of data groups that areallocated (or assigned) to a single sub-frame. For example, when theTNoG is equal to ‘6’, and when the FIC chunk is divided into 8 FICsegments, the TNoG is equal to ‘6’, and the last FIC segment number is‘8’.

According to another embodiment of the present invention, the null FICsegment may be identified by using the value of the FIC_segment_numfield within the FIC segment header. More specifically, since an FICsegment number is not assigned to the null FIC segment, the transmittingsystem allocates null data to the FIC_segment_num field value of thenull FIC segment, and the receiving system may allow the FIC segmenthaving null data assigned to the FIC_segment_num field value to berecognized as the null FIC segment. Herein, instead of the null data,data pre-arranged by the receiving system and the transmitting systemmay be assigned to the FIC_segment_num field value, instead of the nulldata.

As described above, the FIC chunk is divided into a plurality of FICsegments, thereby being transmitted through a single sub-frame or beingtransmitted through multiple sub-frames. Also, FIC segments divided froma single FIC chunk may be transmitted through a single sub-frame, or FICsegments divided from multiple single FIC chunks may be transmittedthrough a single sub-frame. At this point, the number assigned to eachFIC segment corresponds to a number within the corresponding FIC chunk(i.e., the FIC_seg_number value), and not the number within thecorresponding sub-frame. Also, the null FIC segment may be transmittedfor aligning the boundary of the M/H frame and the boundary of the FICchunk. At this point, an FIC segment number is not assigned to the nullFIC segment.

As described above, one FIC chunk may be transmitted through multiplesub-frames, or multiple FIC chunks may be transmitted through a singlesub-frame. However, according to the embodiment of the presentinvention, the FIC segments are interleaved and transmitted in sub-frameunits.

Meanwhile, FIG. 11 illustrates an exemplary structure of a bit streamsyntax of an SMT section providing access information of the SGDD, whichis included in the RS frame and then transmitted. Herein, the SMTsection is configured in an MPEG-2 private section format forsimplicity. However, the SMT section data may be configured in anypossible format.

The SMT may provide access information of mobile services within anensemble including the SMT. Also, the SMT may provide informationrequired for the rendering of mobile services. Furthermore, the SMT mayinclude at least one or more descriptors. Herein, other additional (orsupplementary) information may be described by the descriptor.

According to an embodiment of the present invention, when an SGDD isincluded in an ensemble including the SMT, thereby being received,access information of the SGDD may be provided by using a descriptor ofthe SMT. According to the embodiment of the present invention, thedescriptor of the SMT corresponds to an ensemble level descriptor.

At this point, the service signaling channel that transmits the SMT mayfurther include another signaling table (e.g., GAT) in addition to theSMT.

Herein, according to the embodiment of the present invention, IPdatagrams of the service signaling channel have the same well-knowndestination IP address and the same well-known destination UDP portnumber. Therefore, the SMT included in the service signaling data isdistinguished (or identified) by a table identifier. More specifically,the table identifier may correspond to a table_id existing in thecorresponding table or in a header of the corresponding table section.And, when required, the table identifier may further refer to atable_id_extension field, so as to perform the identification process.Exemplary fields that can be transmitted through the SMT section willnow be described in detail.

A table_id field is an 8-bit table identifier, which may be set up as anidentifier for identifying the SMT. A section_syntax_indicator fieldcorresponds to an indicator defining the section format of the SMT. Forexample, the section_syntax_indicator field shall be set to ‘0’ toalways indicate that this table is derived from the “short” form of theMPEG-2 private section table format may correspond to MPEG long-formsyntax. A private_indicator field is a 1-bit field, which indicateswhether or not the SMT follows (or is in accordance with) a privatesection.

A section_length field is a 12-bit field, which specifies the sectionlength of the remaining SMT data bytes immediately following thesection_length field. A table_id_extension field corresponds to atable-dependent 16-bit field. Herein, the table_id_extension fieldcorresponds to a logical portion of the table_id field providing thescope for the remaining fields. The table_id_extension field includes aSMT_protocol_version field and an ensemble_id field. TheSMT_protocol_version field corresponds to an 8-bit unsigned integerfield. Herein, the SMT_protocol_version field indicates a protocolversion for allowing the corresponding SMT to carry, in a futureprocess, parameters that may be structure differently from those definedin the current protocol. Presently, the value of theSMT_protocol_version field shall be equal to zero (0). Non-zero valuesof the SMT_protocol_version field may be used by a future version ofthis standard to indicate structurally different tables.

An ensemble_id field corresponds to an 8-bit field. Herein, the IDvalues associated with the corresponding ensemble that can be assignedto the ensemble_id field may range from ‘0x00’ and ‘0x3F’. It ispreferable that the value of the ensemble_id field is derived from theTPC data of the parade_id field. When the corresponding ensemble istransmitted through a primary RS frame, the most significant bit (MSB)is set to ‘0’, and the remaining 7 bits are used as the parade_id fieldvalue of the corresponding parade. Meanwhile, when the correspondingensemble is transmitted through a primary RS frame, the most significantbit (MSB) is set to ‘1’, and the remaining 7 bits are used as theparade_id field value of the corresponding parade.

A version_number field corresponds to a 5-bit field, which specifies theversion number of the SMT. A current_next_indicator field corresponds toa 1-bit field indicating whether or not the SMT section is currentlyapplicable. A section_number field is an 8-bit field specifying thenumber of the current SMT section. A last_section_number fieldcorresponds to an 8-bit field that specifies the number of the lastsection configuring the corresponding SMT.

And, a num_MH_services field corresponds to an 8-bit field, whichspecifies the number of mobile services in the corresponding SMTsection. Hereinafter, a number of ‘for’ loop statements equivalent tothe number of mobile services corresponding to the num_MH_services fieldis performed so as to provide signaling information on multiple mobileservices. More specifically, signaling information of the correspondingmobile service is indicated for each mobile service that is included inthe SMT section. Herein, the following field information correspondingto each mobile service may be provided as described below.

An MH_service_id field corresponds to a 16-bit unsigned integer number,which can uniquely identify the corresponding mobile service within thescope of the corresponding SMT section. A Multi_ensemble_service fieldcorresponds to a 2-bit field, which can identify whether or not thecorresponding mobile service is being transmitted more than oneensemble.

An MH_service_status field corresponds to a 2-bit field, which canidentify the status of the corresponding mobile service. Herein, the MSBindicates whether the corresponding mobile service is active (‘1’) orwhether the corresponding mobile service is inactive (‘0’). Also, theLSB indicates whether the corresponding mobile service is hidden (‘1’)or not hidden (‘0’).

An SP_indicator field corresponds to a 1-bit field, which specifiesservice protection status of the corresponding mobile service. If theSP_indicator field is set to ‘1’, then service protection is applied toat least one of the components needed to provide a meaningfulpresentation of the corresponding service. Ashort_MH_service_name_length field corresponds to a 3-bit field, whichindicates the length of a short service name described in ashort_service_name field in byte-length units. The short_MH_service_namefield indicates the short name of the corresponding mobile service. AnMH_service_category field is a 6-bit field, which identifies the typecategory of the corresponding mobile service.

A num_components field corresponds to a 5-bit field, which specifies thenumber of IP stream components in the corresponding mobile service.

An IP_version_flag field corresponds to a 1-bit indicator, which whenset to ‘0’ indicates that a source_IP_address field, anMH_service_destination_IP_address field, and acomponent_destination_IP_address field correspond to IPv4 addresses. Thevalue of ‘1’ for the IP_version_flag field is reserved for any possiblefuture indication that the source_IP_address field, theMH_service_destination_IP_address field, and thecomponent_destination_IP_address field correspond to IPv6 addresses.However, the usage of IPv6 addressing is currently undefined.

A source_IP_address_flag corresponds to a 1-bit Boolean flag, whichindicates, when set, that a source IP address value for thecorresponding service exists (or is present) so as to indicate a sourcespecific multicast. An MH_service_destination_IP_address_flagcorresponds to a 1-bit, which indicates, when set, that thecorresponding IP stream component is transmitted through an IP datagramhaving a destination IP address different from that of theMH_service_destination_IP_address field. Therefore, when theMH_service_destination_IP_address_flag is set, the receiving system mayuse the component_destination_IP_address as the destination_IP_addressin order to access the corresponding IP stream component. Furthermore,the receiving system ignores (or disregards) theMH_service_destination_IP_address field within the num_MH_services loop.

The source_IP_address field corresponds to a 32-bit field or a 128-bitfield. When the source_IP_address_flag is set to ‘1’, thesource_IP_address field is required to be interpreted (or analyzed).However, when the source_IP_address_flag is set to ‘0’, thesource_IP_address field is not required to be interpreted (or analyzed).When the source_IP_address_flag is set to ‘1’, and when theIP_version_flag field is set to ‘0’, the corresponding field indicatesthat the source_IP_address field indicates a 32-bit IPv4 addressspecifying the corresponding mobile service source. Alternatively, ifthe IP_version_flag field is set to ‘1’, the source_IP_address fieldindicates a 32-bit IPv6 address specifying the corresponding mobileservice source.

The MH_service_destination_IP_address field corresponds to a 32-bitfield or a 128-bit field. When theMH_service_destination_IP_address_flag field is set to ‘1’, theMH_service_destination_IP_address_flag is required to be interpreted (oranalyzed). However, when the MH_service_destination_IP_address_flag isset to ‘0’, the MH_service_destination_IP_address_flag is not requiredto be interpreted (or analyzed). Herein, if theMH_service_destination_IP_address_flag is set to ‘1’, and if theIP_version_flag field is set to ‘0’, theMH_service_destination_IP_address field indicates a 32-bit destinationIPv4 address for the corresponding mobile service.

Alternatively, if the MH_service_destination_IP_address_flag is set to‘1’, and if the IP_version_flag field is set to ‘1’, theMH_service_destination_IP_address field indicates a 64-bit destinationIPv6 address for the corresponding mobile service. In case thecorresponding MH_service_destination_IP_address field cannot beinterpreted, the component_destination_IP_address field within thenum_components loop shall be interpreted. And, in this case, thereceiving system shall use the component_destination_IP_address in orderto access the IP stream component.

Meanwhile, the SMT according to the embodiment of the present inventionprovides information on multiple components using the ‘for’ loopstatement. Hereinafter, a number of ‘for’ loop statements (or componentloops) equivalent to the number of components corresponding to thenum_component field value is performed so as to provide accessinformation on multiple components. More specifically, accessinformation of each component included in the corresponding mobileservice is provided. In this case, the following field information oneach component may be provided as described below.

An essential_component_indicator field is a 1-bit indicator, which, whenset to ‘1’, indicates that the corresponding component is an essentialcomponent for the service. Otherwise, the essential_component_indicatorfield indicates that the corresponding component is an optionalcomponent. A component_destination_IP_address_flag field corresponds toa 1-bit Boolean flag. When the component_destination_IP_address_flagfield is set to ‘1’, this indicates that acomponent_destination_IP_address exists for the corresponding component.A port_num_count field corresponds to a 6-bit field, which indicates aUDP port number associated with the corresponding UDP/IP streamcomponent. Herein, the destination UDP Port number value is increased by1 starting from a destination_UDP_port_num field value. Thedestination_UDP_port_num field corresponds to a 16-bit field, whichindicates a destination UDP port number for the corresponding IP streamcomponent.

A component_destination_IP_address field corresponds to a 32-bit fieldor a 128-bit field. When the IP_version_flag field is set to ‘0’, thecomponent_destination_IP_address field indicates a 32-bit destinationIPv4 address for the corresponding IP stream component. Furthermore,when the IP_version_flag field is set to ‘1’, thecomponent_destination_IP_address field indicates a 128-bit destinationIPv6 address for the corresponding IP stream component. When this fieldis present, the destination address of the IP datagrams carrying thecorresponding component of the M/H service shall match the address inthe component_destination_IP_address field. Alternatively, when thisfield is not present, the destination address of the IP datagramscarrying the corresponding component shall match the address in theM/H_service_destination_IP_address field. The conditional use of the 128bit-long address version of this field is to facilitate possible futureusage of the IPv6, although the usage of the IPv6 is currentlyundefined.

A num_component_level_descriptors field corresponds to a 4-bit field,indicating a number of descriptors providing additional information onthe component level. A number of component_level_descriptor( )corresponding to the value of the num_component_level_descriptors fieldis included in the component loop, so as to provide additional (orsupplemental) information on the corresponding component. Anum_MH_service_level_descriptors field corresponds to a 4-bit fieldindicating a number of descriptors providing additional information ofthe corresponding mobile service level.

A number of service_level_descriptor( ) corresponding to the value ofthe num_MH_service_level_descriptors field is included in the mobileservice loop, so as to provide additional (or supplemental) informationon the mobile service. A num_ensemble_level_descriptors fieldcorresponds to a 4-bit field, which indicates a number of descriptorsproviding additional information on ensemble levels. Furthermore, anumber of ensemble_level_descriptor( ) corresponding to the value of thenum_ensemble_level_descriptors field is included in the ensemble loop,so as to provide additional (or supplemental) information on theensemble.

Meanwhile, when the FIC indicates that an ESG entry point (i.e., SGDD)is included in the ensemble corresponding to the ensemble identifier ofthe SMT, a SG_Access_Descriptor is included in the ensemble leveldescriptor of the SMT. For example, it is assumed that the FIC uses atleast one of the ESG_EntryPoint_Location field and theSG_entry_point_indicator field, so as to indicate that an SGDD isincluded in the ensemble having an ensemble identifier A. In this case,when the ensemble_id field value of the SMT is equal to ‘A’, anSG_Access_Descriptor is included in the SMT, thereby being received.According to an embodiment of the present invention, theSG_Access_Descriptor provides access information of a service guideannouncement channel transmitting the SGDD. The access information ofthe service guide announcement channel includes service guide bootstrapinformation. The service guide bootstrap information includes atransmission session identifier of a FLUTE session transmitting theservice guide announcement channel.

FIG. 12 illustrates a structure of a bit stream syntax of aSG_Access_Descriptor( ) according to an embodiment of the presentinvention. Each field of the SG_Access_Descriptor( ) will now bedescribed in detail. Referring to FIG. 12, a descriptor_tag fieldcorresponds to an 8-bit descriptor identifier. Herein, thedescriptor_tag field indicates an identifier identifying theSG_Access_Descriptor( ). A descriptor_length field corresponds to an8-bit field. The descriptor_length field indicates the length of theremaining portion of the descriptor in byte units starting from the endof the descriptor_length field to the end of the SG_Access_Descriptor().

When a value of an IP_version_flag field is set to ‘1’, this indicatesthat a destination_IP_address field corresponds to an IPv6 address. And,when the value of the IP_version_flag field is set to ‘0’, thisindicates that the destination_IP_address field corresponds to an IPv4address. A address_count field corresponds to a 7-bit counter, whichindicates the number of IP addresses above the destination_IP_addressfield that are being transmitted for the transport of mobile servicedata.

The destination_IP_address field corresponds to a 32-bit field or a128-bit field, which represents a destination IP address of a FLUTEsession transmitting the service guide announcement channel. When theIP_version_flag field is set to ‘0’, the destination_IP_address fieldindicates a 32-bit destination IPv4 address for the correspondingservice guide announcement channel. Alternatively, when theIP_version_flag field is set to ‘1’, the destination_IP_address fieldindicates a 64-bit destination IPv6 address for the correspondingservice guide announcement channel.

A destination_UDP_port_num field corresponds to a 16-bit field, whichrepresents a destination UDP port number of a FLUTE session transmittingthe service guide announcement channel. An announcement_channel_TSIfield is a 16-bit field, which indicates a transmission sessionidentifier for the FLUTE session, through which the service guideannouncement channel is transmitted.

More specifically, the destination_IP_address field and thedestination_UDP_port_num field are used to acquire an IP datagram of aservice guide announcement channel transmitting the SGDD from thecorresponding ensemble. Then, after removing the ALC/LCT header from theacquired IP datagram, the announcement_channel_TSI field is used toaccess the corresponding FLUTE session, thereby receiving the SGDD.Thereafter, the FLUTE session information of SGDUs may be acquired fromthe SGDD.

And, based upon the FLUTE session information, all FLUTE sessions areaccessed so as to receive the SGDUs. Herein, one SGDU includes at leastone or more fragments.

At this point, when the service guide announcement channel carries awell-known destination IP address and a well-known destination UDP portnumber, the destination_IP_address field and thedestination_UDP_port_num field may be omitted.

Meanwhile, the access information of the SGDD shown in FIG. 12 may beprovided in a table format. In this case, according to the embodiment ofthe present invention, the table including the SGDD access informationis transmitted through the service signaling channel. Also, according tothe present invention, the identification of the table including SGDDaccess information is performed by using a table identifier. The tableidentifier may correspond to a table_id field existing in thecorresponding table or in the header of the corresponding table section.And, when required, further reference may be made to thetable_id_extension field, so as to perform the identification process.

FIG. 13 illustrates the structure of a service guide that is to be usedin the M/H system according to the present invention and the co-relationbetween the FIC chunk and the SMT. Each SG fragment is grouped in SGDUunits so as to be transmitted through a FLUTE session. Herein, the SGDDincludes access information corresponding to the FLUTE sessiontransmitting each SGDU. The FIC chunk indicates the ensemble throughwhich the SGDD is being transmitted. And, the SMT included in theensemble transmitting the SGDD uses an SG access descriptor in order tonotify (or indicate) an IP access information or a FLUTE session accessinformation of the SGDD. Thus, the receiving system may be capable ofefficiently accessing the ESG.

Referring to FIG. 13, the service guide includes an administrativegroup, a provisioning group, a core group, and an access group. Herein,the administrative group provides upper-level configuration informationof the overall service guide. The provisioning group providesinformation on the subscription and purchase of services. The core groupprovides core information of the service guide, such as the service, thecontent, and the service schedule. And, finally, the access groupprovides access information for accessing a specific service or content.

More specifically, in FIG. 13, the administrative group corresponds to agroup providing the basic information for the receiving system toreceive a service guide. Herein, the administrative group includes theservice guide delivery descriptor (SGDD). The SGDD indicates accessinformation of a FLUTE session in which a service guide delivery unit(SGDU) including at least one or more fragments is located. Herein, afragment corresponds to a minimum unit configuring the service guide.The SGDD also indicates an entry point for receiving groupinginformation on the SGDU and a notification message.

The provisioning group corresponds to a group providing information onthe fees charged for receiving services. Herein, the provisioning groupincludes a purchase item fragment, a purchase data fragment, and apurchase channel fragment. The core group corresponds to a groupproviding information on the service itself. Herein, the core groupincludes a service fragment, a schedule fragment, and a contentfragment. The access group includes an access fragment and a sessiondescription fragment. In addition to the above-described groups, theservice guide may also include a previewData fragment and aninteractiveData fragment. The arrows shown in FIG. 13 indicate thereference relation between each fragment. According to the example shownin FIG. 13, the schedule fragment, the content fragment, the purchaseitem fragment, and the access fragment may refer to the servicefragment. And, the schedule fragment may refer the service fragment andthe content fragment. The numbers shown above each arrow in FIG. 13respectively indicate the available number of lower-level unitinformation. Also, these numbers indicate the available number offragments.

The essential fragments among the above-mentioned fragments will now bedescribed in detail.

The service fragment includes information on a service provided to auser (e.g., information on a service such as a conventional televisionchannel).

The content fragment includes metadata on the corresponding content. Forexample, a content type, such as A/V data, text data, image data, may beincluded in the content fragment.

The schedule fragment includes schedule information on a single contentwithin the provided service. For example, a broadcast time of thecorresponding content may correspond to the schedule information.

The purchase item fragment includes item information associated withpurchasing.

The purchase data fragment includes information associated with thepurchase of a service, which may be purchased by the user. The purchasechannel fragment indicates an interface used by the user or a terminalin order to communicate with a purchase system. The purchase channelfragment includes one of a parameter associated with the purchase systemand information on managing a purchase channel.

The access fragment includes information associated with accessing aservice or content.

Detailed element value and property value for each fragment of theservice guide have not been included in the description of the presentinvention for simplicity. Nevertheless, such detailed element value andproperty value shall not limit the present invention. In providingservice guide for mobile broadcast services, the present invention mayapply all detailed element values and property values that are definedas required.

FIG. 14 illustrates a flow chart showing a method of receiving a serviceguide by using an FIC chunk and the SMT according to an embodiment ofthe present invention. Referring to FIG. 14, when the tuner tunes to aphysical transport channel including a user-selected mobile service, thesystem verifies a mobile broadcast signal transmitting the user-selectedmobile service from the tuned physical transport channel (S101). And,the verified mobile broadcast signal is demodulated (S102). Thereafter,FIC segments are acquired from the demodulated mobile broadcast signal,thereby recovering the FIC chunk (S103 and S104).

More specifically, the system finds out the sub-frame transmitting thedemodulated mobile broadcast signal and slots allocated to thesub-frame. Subsequently, data groups being received through the slots ofthe found sub-frame are gathered. Then, PCCC-decoding is performed onthe FIC data being received to each signaling information region of thegathered data groups. Then, after deinterleaving the PCCC-decoded FICdata in sub-frame units, RS-decoding is performed on the processed dataas an inverse process of the transmitting system. Accordingly, the FICsegments are recovered for each sub-frame. This process is performed onone or more sub-frames. And, an FIC chunk is recovered from the FICsegment payloads based upon the FIC_type field, the FIC_segment_numfield, and the FIC_last_segment_num field within each header of the FICsegments, which are recovered from one or more sub-frames.

According to an embodiment of the present invention, the recovered FICchunk is configured of an FIC chunk header of FIG. 8 and an FIC chunkpayload of FIG. 9.

A transport stream ID of a mobile broadcast carrying the FIC chunk isidentified from the transport_stream_id field of the recovered FIC chunkheader (S105). And, mapping information between an ensemble and a mobileservice is configured by using the information included in the recoveredFIC chunk (S106). The mapping information between the ensemble and themobile service may include an ensemble identifier, a service identifierincluded in the ensemble identified by the ensemble identifier, andservice type information. Thereafter, the ensemble in which the SGDD isincluded and received is verified from the recovered FIC chunk (S107).

In the present invention, reference may be made to both theESG_EntryPoint_Location field value of the FIC chunk header and theSG_entry_point_indicator field value of the FIC chunk payload, so as toverify the ensemble in which the SGDD is included. Alternatively, onlyone of the two field values may be referred to, so as to verify theensemble in which the SGDD is included. When the ensemble including theSGDD is identified in step 107, the receiving system is shifted to atime-slicing mode for receiving the corresponding ensemble, so as toreceive RS frames belonging to the identified ensemble for each M/Hframe (S108). According to an embodiment of the present invention, thereceiving system receives RS frames belonging to the ensemble having thevalue of the SG_entry_point_indicator field within the FIC chunk payloadset to ‘1’.

Then, the SMT is acquired from the received RS frame (S109). Accordingto an embodiment of the present invention, the SMT is included in aservice signaling channel having a well-known IP address and awell-known UDP port number, thereby being received. More specifically,the SMT is acquired by using a table identifier from the IP datagram ofthe service signaling channel having the well-known IP address and awell-known UDP port number. Among the descriptors included in theacquired SMT, the system processes the SG access descriptor, so as toacquire IP access information of an ESG entry point (i.e., SGDD) (S110).According to an embodiment of the present invention, the SG accessdescriptor includes a destination IP address, a destination UDP portnumber, and a TSI of the service guide announcement channel.Accordingly, by using the destination IP address and the destination UDPport number, the IP datagram of the service guide signaling channeltransmitting the SGDD may be acquired from the corresponding RS frame(S111).

After removing the ALC/LCT header from the acquired IP datagram, thesystem accesses to the corresponding FLUTE session by using theannouncement_channel_TSI field, thereby so as to receive the SGDD(S112). Then, after acquiring access information of the SGDUs from thereceived SGDD, the system accesses each FLUTE session based upon theacquired access information, so as to gather the SGDUs (S113). The SGDUincludes one or more fragments. Then, SG data are extracted from thefragments included in the gathered SGDUs, thereby being stored.Thereafter, when requested by a user in a later process, the receiverdisplays SG information based upon the stored SG data.

According to the embodiment of the present invention, step 103 isperformed by the signaling decoder, step 104 to step 107 are performedby the FIC handler or the physical adaptation control signal handler,and step 108 is performed by the RS frame decoder and the RS framehandler. Furthermore, according to the embodiment of the presentinvention, step 109 and step 110 are performed by the SI handler or thephysical adaptation control signal handler, step 111 is performed by theIP network stack, and step 112 and step 113 are performed by the filehandler and the ESG handler or the physical adaptation control signalhandler.

Receiving System

FIG. 15 illustrates a block diagram showing a general structure of areceiving system according to an embodiment of the present invention.The receiving system according to the present invention includes abaseband processor 100, a management processor 200, and a presentationprocessor 300.

The baseband processor 100 includes an operation controller 110, a tuner120, a demodulator 130, an equalizer 140, a known sequence detector (orknown data detector) 150, a block decoder (or mobile handheld blockdecoder) 160, a primary Reed-Solomon (RS) frame decoder 170, a secondaryRS frame decoder 180, and a signaling decoder 190.

The operation controller 110 controls the operation of each blockincluded in the baseband processor 100.

By tuning the receiving system to a specific physical channel frequency,the tuner 120 enables the receiving system to receive main service data,which correspond to broadcast signals for fixed-type broadcast receivingsystems, and mobile service data, which correspond to broadcast signalsfor mobile broadcast receiving systems. At this point, the tunedfrequency of the specific physical channel is down-converted to anintermediate frequency (IF) signal, thereby being outputted to thedemodulator 130 and the known sequence detector 140.

The passband digital IF signal, which is outputted from the tuner 120,may include only the main service data, or include only the mobileservice data, or include a combination of the main service data and themobile service data. The mobile service data may correspond to RS framedata. Alternatively, the mobile service data may correspond to datarequired for mobile services within a data group.

The demodulator 130 performs self-gain control, carrier recovery, andtiming recovery processes on the passband digital IF signal inputtedfrom the tuner 120, thereby translating the IF signal to a basebandsignal. Then, the demodulator 130 outputs the baseband signal to theequalizer 140 and the known sequence detector 150. The demodulator 130uses the known data symbol sequence inputted from the known sequencedetector 150 during the timing and/or carrier recovery, therebyenhancing the demodulating performance.

The equalizer 140 compensates channel-associated distortion included inthe signal demodulated by the demodulator 130. Then, the equalizer 140outputs the distortion-compensated signal to the block decoder 160. Byusing a known data symbol sequence inputted from the known sequencedetector 150, the equalizer 140 may enhance the equalizing performance.Furthermore, the equalizer 140 may receive feed-back on the decodingresult from the block decoder 160, thereby enhancing the equalizingperformance.

The known sequence detector 150 detects known data place (or position)inserted by the transmitting system from the input/output data (i.e.,data prior to being demodulated or data being processed with partialdemodulation). Then, the known sequence detector 150 outputs thedetected known data position information and known data sequencegenerated from the detected position information to the demodulator 130and the equalizer 140. Additionally, in order to allow the block decoder160 to identify the mobile service data that have been processed withadditional encoding by the transmitting system and the main service datathat have not been processed with any additional encoding, the knownsequence detector 150 outputs such corresponding information to theblock decoder 160.

If the data channel-equalized by the equalizer 140 and inputted to theblock decoder 160 correspond to data processed with both block-encodingand trellis-encoding using serial concatenated convolution code (SCCC)by the transmitting system (i.e., data within the RS frame), the blockdecoder 160 may perform trellis-decoding and block-decoding as inverseprocesses of the transmitting system. On the other hand, if the datachannel-equalized by the equalizer 140 and inputted to the block decoder160 correspond to data processed only with trellis-encoding and notblock-encoding by the transmitting system (i.e., main service data), theblock decoder 160 may perform only trellis-decoding.

The signaling decoder 190 decoded signaling data that have beenchannel-equalized and inputted from the equalizer 140. It is assumedthat the signaling data (i.e., signaling information) inputted to thesignaling decoder 190 correspond to data processed with bothblock-encoding and trellis-encoding by the transmitting system. Examplesof such signaling data may include transmission parameter channel (TPC)data and fast information channel (FIC) data. For example, among thedata that are being inputted, the signaling decoder 190 performsregressive turbo decoding of a parallel concatenated convolution code(PCCC) method on data corresponding to the signaling information region.Subsequently, the signaling decoder 190 separates FIC data and TPC datafrom the regressive-turbo-decoded signaling data. Additionally, thesignaling decoder 190 performs RS-decoding as inverse processes of thetransmitting system on the separated TPC data, thereby outputting theprocessed data to the TPC handler 214. Also, the signaling decoder 190performs deinterleaving in sub-frame units on the separated FIC data, soas to perform RS-decoding as inverse processes of the transmittingsystem on the deinterleaved FIC data, thereby outputting the processeddata to the FIC handler 215. The FIC data being deinterleaved andRS-decoded from the signaling decoder 190 and outputted to the FIChandler 215 are transmitted in units of FIC segments.

Meanwhile, according to the present invention, the transmitting systemuses RS frames by encoding units. Herein, the RS frame may be dividedinto a primary RS frame and a secondary RS frame. However, according tothe embodiment of the present invention, the primary RS frame and thesecondary RS frame will be divided based upon the level of importance ofthe corresponding data.

The primary RS frame decoder 170 receives the data outputted from theblock decoder 160. At this point, according to the embodiment of thepresent invention, the primary RS frame decoder 170 receives the data ofthe primary RS frame that have been Reed-Solomon (RS)-encoded and/orcyclic redundancy check (CRC)-encoded from the block decoder 160. Theprimary RS frame decoder 170 performs inverse processes of an RS frameencoder (not shown) included in the transmitting system, therebycorrecting errors existing within the primary RS frame. Morespecifically, the primary RS frame decoder 170 forms a primary RS frameby grouping a plurality of data groups and, then, correct errors inprimary RS frame units.

Additionally, the secondary RS frame decoder 180 receives the dataoutputted from the block decoder 160. At this point, according to theembodiment of the present invention, the secondary RS frame decoder 180receives the data of the secondary RS frame that have been RS-encodedand/or CRC-encoded from the block decoder 160. The secondary RS framedecoder 180 performs inverse processes of an RS frame encoder (notshown) included in the transmitting system, thereby correcting errorsexisting within the secondary RS frame. More specifically, the secondaryRS frame decoder 180 forms a secondary RS frame by grouping a pluralityof data groups and, then, correct errors in secondary RS frame units.

Meanwhile, the management processor 200 according to an embodiment ofthe present invention includes an MH physical adaptation processor 210,an IP network stack 220, a streaming handler 230, a system information(SI) handler 240, a file handler 250, a multi-purpose internet mainextensions (MIME) type handler 260, and an electronic service guide(ESG) handler 270, and an ESG decoder 280, and a storage unit 290.

The MH physical adaptation processor 210 includes a primary RS framehandler 211, a secondary RS frame handler 212, an MH transport packet(TP) handler 213, a TPC handler 214, an FIC handler 215, and a physicaladaptation control signal handler 216.

The TPC handler 214 extracts signaling information included in the TPCdata outputted from the signaling decoder 190, thereby enabling theextracted signaling information to output to the physical adaptationcontrol signal handler 216.

The TPC data may include a sub-frame number, a slot number, a paradeidentifier (parade id), a starting group number (SGN), a number ofgroups (NoG), a parade repetition cycle (PRC), an RS frame mode, an RScode mode, an SCCC block mode, an SCCC outer code mode, an FIC version,a parade continuity counter (PCC), a TNoG, and a TPC protocol version,and so on.

The sub-frame number information indicates the number of a currentsub-frame within a corresponding M/H frame and is transmitted for M/Hframe synchronization.

The slot number information is the current Slot number within theSub-Frame.

The parade identifier information identifies the Parade to which thisGroup belongs. Each Parade in an M/H transmission shall have a uniqueParade identifier. In this case, communication of the Parade identifierbetween the physical layer and the management layer shall be performedby means of an ensemble identifier formed by adding one bit to the leftof the Parade identifier. If the Ensemble identifier is for the primaryensemble delivered through this Parade, the added MSB shall be ‘0’.Otherwise, if it is for the secondary ensemble, the added MSB shall be‘1’.

The starting Group number (SGN) information shall be the first Slotnumber for a Parade to which this Group belongs (after the Slot numbersfor all preceding Parades have been calculated). The number of Groups(NoG) information shall be the number of Groups in a Sub-Frame assignedto the Parade to which this Group belongs.

The Parade repetition cycle (PRC) information shall be the cycle timeover which the Parade is transmitted, specified in units of M/H Frames.The RS frame mode information indicates whether a single parade carriesa single RS frame or two RS frames. The RS code mode informationindicates an RS code mode for a RS frame. The SCCC block modeinformation indicates how M/H blocks within a data group are allocatedto SCCC block. The SCCC outer code mode information indicates an SCCCouter mode code for a data group. The FIC version information indicatesa version of FIC data. The Parade continuity counter information isincremented to 0˜15 and is incremented by 1 for each (PRC+1) M/H frame.For instance, if PRC=011, the Parade_continuity_counter field isincremented each fourth M/H frame.

The TNoG information indicates the total number of data groups to betransmitted during a Sub-Frame. The TPC protocol version informationrepresents a version of the corresponding TPC syntax structure.

However, the information included in the TPC data presented herein ismerely exemplary. And, since the adding or deleting of informationincluded in the TPC may be easily adjusted and modified by one skilledin the art, the present invention will, therefore, not be limited to theexamples set forth herein.

The FIC handler 215 receives FIC data from the signaling decoder 190, soas to extract signaling information for service acquisition (i.e.,mapping information between an ensemble and a mobile service).

The primary RS frame handler 211 identifies primary RS frames receivedfrom the primary RS frame decoder 170 of the baseband processor 100 foreach row unit, so as to configure an MH TP. Thereafter, the primary RSframe handler 211 outputs the configured MH TP to the MH TP handler 213.

The secondary RS frame handler 212 identifies secondary RS framesreceived from the secondary RS frame decoder 180 of the basebandprocessor 100 for each row unit, so as to configure an MH TP.Thereafter, the secondary RS frame handler 212 outputs the configured MHTP to the MH TP handler 213.

The MH transport packet (TP) handler 213 extracts a header from each MHTP received from the primary RS frame handler 211 and the secondary RSframe handler 212, thereby determining the data included in thecorresponding MH TP. Then, when the determined data correspond to SIdata (i.e., SI data that are not encapsulated to IP datagrams), thecorresponding data are outputted to the physical adaptation controlsignal handler 216. Alternatively, when the determined data correspondto an IP datagram, the corresponding data are outputted to the IPnetwork stack 220.

The IP network stack 220 processes broadcast data that are beingtransmitted in the form of IP datagrams. More specifically, the IPnetwork stack 220 processes data that are inputted via user datagramprotocol (UDP), real-time transport protocol (RTP), real-time transportcontrol protocol (RTCP), asynchronous layered coding/layered codingtransport (ALC/LCT), file delivery over unidirectional transport(FLUTE), and so on. Herein, when the processed data correspond tostreaming data, the corresponding data are outputted to the streaminghandler 230. And, when the processed data correspond to data in a fileformat, the corresponding data are outputted to the file handler 250.Finally, when the processed data correspond to SI-associated data, thecorresponding data are outputted to the SI handler 240. For example, theSMT acquired from the IP datagram of a service signaling channel isoutputted to the SI handler 240.

The SI handler 240 receives and processes SI data having the form of IPdatagrams, which are inputted to the IP network stack 220.

When the inputted data associated with SI correspond to MIME-type data,the inputted data are outputted to the MIME-type handler 260.

The MIME-type handler 260 receives the MIME-type SI data outputted fromthe SI handler 240 and processes the received MIME-type SI data.

The file handler 250 receives data from the IP network stack 220 in anobject format in accordance with the ALC/LCT and FLUTE structures. Thefile handler 250 groups the received data to create a file format.Herein, when the corresponding file includes ESG, the file is outputtedto the ESG handler 270. On the other hand, when the corresponding fileincludes data for other file-based services, the file is outputted tothe presentation controller 330 of the presentation processor 300.

The ESG handler 270 processes the ESG data received from the filehandler 250 and stores the processed ESG data to the storage unit 290.Alternatively, the ESG handler 270 may output the processed ESG data tothe ESG decoder 280, thereby allowing the ESG data to be used by the ESGdecoder 280.

The storage unit 290 stores the system information (SI) received fromthe physical adaptation control signal handler 210 and the ESG handler270 therein. Thereafter, the storage unit 290 transmits the stored SIdata to each block.

The ESG decoder 280 either recovers the ESG data and SI data stored inthe storage unit 290 or recovers the ESG data transmitted from the ESGhandler 270. Then, the ESG decoder 280 outputs the recovered data to thepresentation controller 330 in a format that can be outputted to theuser.

The streaming handler 230 receives data from the IP network stack 220,wherein the format of the received data are in accordance with RTPand/or RTCP structures. The streaming handler 230 extracts audio/videostreams from the received data, which are then outputted to theaudio/video (A/V) decoder 310 of the presentation processor 300. Theaudio/video decoder 310 then decodes each of the audio stream and videostream received from the streaming handler 230.

The display module 320 of the presentation processor 300 receives audioand video signals respectively decoded by the A/V decoder 310. Then, thedisplay module 320 provides the received audio and video signals to theuser through a speaker and/or a screen.

The presentation controller 330 corresponds to a controller managingmodules that output data received by the receiving system to the user.

The channel service manager 340 manages an interface with the user,which enables the user to use channel-based broadcast services, such aschannel map management, channel service connection, and so on.

The application manager 350 manages an interface with a user using ESGdisplay or other application services that do not correspond tochannel-based services.

More specifically, the FIC handler 215 recovers the FIC chunk from thedeinterleaved and RS-decoded FIC segments outputted from the signalingdecoder 190. Then, the FIC handler 215 analyzes the recovered FIC chunkso as to extract the signaling information for service acquisition,thereby outputting the acquired signaling information to the physicaladaptation control signal handler 216.

At this point, the FIC handler 215 recovers an FIC chunk from the FICsegment payloads based upon the FIC_type field, the FIC_segment_numfield, and the FIC_last_segment_num field within each header of the FICsegments, which are recovered from one or more sub-frames decoded by thesignaling decoder 190. Then, the FIC handler 215 uses the informationincluded in the recovered FIC chunk so as to verify the ensemble inwhich the SGDD is included and received. Thereafter, the FIC handler 215outputs the verified result to the physical adaptation control signalhandler 216. In the present invention, reference may be made to both theESG_EntryPoint_Location field value of the FIC chunk header and theSG_entry_point_indicator field value of the FIC chunk payload, so as toverify the ensemble in which the SGDD is included. Alternatively, onlyone of the two field values may be referred to, so as to verify theensemble in which the SGDD is included.

The physical adaptation control signal handler 216 identifies anensemble including the SGDD by using the TPC data being outputted fromthe TPC handler 214 and by using the SMT data being outputted from theSI handler 240. Then, the system is switched to the time-slicing modethat receives the identified ensemble, thereby controlling the basebandprocessor 100 so that the RS frame belonging to the ensemble can bereceived for each M/H frame. Subsequently, access information of theSGDD or the service guide announcement channel transmitting the SGDD isacquired from the SMT included in the received RS frame. Then, thesystem is controlled so that the SGDD can be received based upon theacquired access information.

Furthermore, access information of the SGDUs are acquired from thereceived SGDD. Then, the system accesses each FLUTE session based uponthe acquired access information, so as to gather the SGDUs. Thereafter,SG data are extracted from the fragments included in the gathered SGDUs.Subsequently, the system is controlled so that the extracted SG data arestored in the storage unit 290. In a later process, when a user-requestis inputted, the presentation processor 300 displays the SG informationonto a display screen based upon the SG data stored in the storage unit290.

As described above, according to the embodiment of the presentinvention, the access information of the service guide announcementchannel including the service guide bootstrap information is signaledthrough an ensemble-level descriptor (e.g., SG access descriptor) of theSMT included in the service signaling channel.

According to anther embodiment of the present invention, the accessinformation of the service guide channel including the service guidebootstrap information may be signaled through the guide access table(GAT). The GAT is included in the service signaling channel, therebybeing received.

At this point, the IP datagrams of the service signaling channel sharethe same well-known destination IP address and the same well-knowndestination UDP port number. Therefore, the identification of the GATincluded in the service signaling data is performed by a tableidentifier. More specifically, the table identifier may correspond to atable_id field existing in the corresponding table or in the header ofthe corresponding table section. And, when required, the identificationprocess may be performed by further referring to the table_id_extensionfield. According to an embodiment of the present invention, the GATincludes an announcement_channel_TSI field, which is included in the SGaccess descriptor shown in FIG. 12.

If the access information of the service guide announcement channelincluding the service guide bootstrap information is signaled by usingthe GAT, the SG_entry_point_indicator field of FIG. 9 indicates whetheror not the GAT is being transmitted to the service signaling channel,which is included in the corresponding ensemble. For example, when theSG_entry_point_indicator field value is equal to ‘1’, this indicatesthat the GAT is transmitted to the service signaling channel included inthe corresponding ensemble. Furthermore, even when the GAT is includedin the service signaling channel, the flow chart of FIG. 14 and thereceiving system of FIG. 15 may be used. In this case, the onlydifference is that the access information of the service guideannouncement channel is acquired from the GAT and not from the SMT.

FIG. 16 illustrates an exemplary syntax structure of a GAT section amongmultiple signaling tables transmitted to the IP signaling channelaccording to the present invention.

Referring to FIG. 16, an identifier identifying the GAT may be set as atable_id field, which corresponds to the table identifier. Herein, theGAT of FIG. 16 assigns an 8-bit ensemble_id field and an 8-bitGAT_protocol_version field to the position of a table_id_extensionfield, so that the newly assigned fields may be used as one of the tableidentifiers for identifying the GAT, when the GAT is received throughthe IP signaling channel. As shown in FIG. 16, asection_syntax_indicator field corresponds to an indicator defining aGAT section format. A private_indicator field indicates to which privatesection the GAT belongs. A section_length field indicates the sectionlength of the GAT.

The ensemble_id field is an 8-bit field, which corresponds to an IDvalue associated to the corresponding MH ensemble. Herein, theensemble_id field may be assigned with a value ranging from range ‘0x00’to ‘0x3F’. It is preferable that the value of the ensemble_id field isderived from the parade_id of the TPC data, which is carried from thebaseband processor of MH physical layer subsystem. When thecorresponding MH ensemble is transmitted through (or carried over) theprimary RS frame, a value of ‘0’ may be used for the most significantbit (MSB), and the remaining 7 bits are used as the parade_id value ofthe associated MH parade (i.e., for the least significant 7 bits).Alternatively, when the corresponding MH ensemble is transmitted through(or carried over) the secondary RS frame, a value of ‘1’ may be used forthe most significant bit (MSB), and the remaining 7 bits are used as theparade_id value of the associated MH parade (i.e., for the leastsignificant 7 bits).

A GAT_protocol_version field indicates the protocol version of thecorresponding GAT.

A version_number field indicates the version number of the GAT. Asection_number field indicates the section number of the current GATsection. A last_section_number field indicates the last section numberof the GAT. A num_SG_providers field indicates a number of SG providersdescribed in the current GAT section. An SG_provider_id field indicatesa unique indicator that can identify each SG provider. AnSG_provider_name_length field indicates the total length of anSG_provider_name_text( ) field that follows. The SG_provider_name_text() field indicates the name of the corresponding SG provider.

A source_IP_address field represents a source IP address of a FLUTEsession transmitting the service guide announcement channel.

When a value of an IP_version_flag field is set to ‘1’, this indicatesthat a destination_IP_address field corresponds to an IPv6 address. And,when the value of the IP_version_flag field is set to ‘0’, thisindicates that the destination_IP_address field corresponds to an IPv4address.

The destination_IP_address field corresponds to a 32-bit field or a128-bit field, which represents a destination IP address of a FLUTEsession transmitting the service guide announcement channel. When theIP_version_flag field is set to ‘0’, the destination_IP_address fieldindicates a 32-bit destination IPv4 address for the correspondingservice guide announcement channel. Alternatively, when theIP_version_flag field is set to ‘1’, the destination_IP_address fieldindicates a 64-bit destination IPv6 address for the correspondingservice guide announcement channel.

A destination_UDP_port_num field corresponds to a 16-bit field, whichrepresents a destination UDP port number of a FLUTE session transmittingthe service guide announcement channel. An announcement_channel_TSIfield is a 16-bit field, which indicates a transmission sessionidentifier for the FLUTE session, through which the service guideannouncement channel is transmitted.

As described above, the digital broadcasting system and data processingmethod have the following advantages.

The present invention can signal mapping information between an ensembleand a mobile service by using an FIC chunk, and can divide and transmitthe FIC chunk into FIC segment units, thereby enabling a receivingsystem to perform quick service acquisition.

Also, by using signaling information of an FIC chunk and signalinginformation being received through a service signaling channel, thepresent invention may efficiently identify an ensemble transmittingservice guide information and may also receive service guide informationfrom an RS frame belonging to the identified ensemble, therebyprocessing and using the received service guide information.

More specifically, the present invention are highly protected against(or resistant to) any error that may occur when transmitting mobileservice data through a channel. And, the present invention is alsohighly compatible to the conventional receiving system. Moreover, thepresent invention may also receive the mobile service data without anyerror even in channels having severe ghost effect and noise.Furthermore, by inserting known data in a particular position (or place)within a data region and transmitting the processed data, the receivingperformance of the receiving system may be enhanced even in a channelenvironment that is liable to frequent changes. Finally, the presentinvention is even more effective when applied to mobile and portablereceivers, which are also liable to a frequent change in channel andwhich require protection (or resistance) against intense noise.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the inventions. Thus, itis intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

What is claimed is:
 1. A receiving system for processing broadcast data,the receiving system comprising: a tuner to receive a broadcast signalthat includes a transmission frame comprising one or more sub-frames,the transmission frame including broadcast service data for a broadcastservice, first signaling information for fast service acquisition,second signaling information describing at least one component of thebroadcast service, and physical layer parameters, wherein the firstsignaling information includes information for identifying whether aservice guide is provided, version information related to the secondsignaling information, and protection information for indicating whetherthe at least one component is protected, wherein the second signalinginformation includes access information of a service guide deliverydescriptor (SGDD) describing a service guide delivery unit (SGDU) thatincludes service guide data, wherein the access information of the SGDDincludes transport session identification information, destinationaddress information and destination port information, and wherein thephysical layer parameters include information related to the one or moresub-frames; a demodulator to demodulate the received broadcast signal; asignaling decoder to decode the physical layer parameters in thedemodulated broadcast signal; and a decoder to decode the broadcastservice data in the demodulated broadcast signal.
 2. The receivingsystem of claim 1, wherein the SGDU is received in a Layered CodingTransport (LCT) method of a unidirectional transport protocol.
 3. Thereceiving system of claim 1, further comprising: a first handler toaccess the SGDD based on the first signaling information and the secondsignaling information; and a second handler to acquire the service guidedata in the SGDU based on the accessed SGDD.
 4. The receiving system ofclaim 3, wherein the acquired service guide data are at least stored ina storage unit or displayed on a screen.
 5. A method of processingbroadcast data in a receiving system, the method comprising: receiving abroadcast signal that includes a transmission frame comprising one ormore sub-frames, the transmission frame including broadcast service datafor a broadcast service, first signaling information for fast serviceacquisition, second signaling information describing at least onecomponent of the broadcast service, and physical layer parameters,wherein the first signaling information includes information foridentifying whether a service guide is provided, version informationrelated to the second signaling information, and protection informationfor indicating whether the at least one component is protected, whereinthe second signaling information includes access information of aservice guide delivery descriptor (SGDD) describing a service guidedelivery unit (SGDU) that includes service guide data, wherein theaccess information of the SGDD includes transport session identificationinformation, destination address information and destination portinformation, and wherein the physical layer parameters includeinformation related to the one or more sub-frames; demodulating thereceived broadcast signal; decoding the physical layer parameters in thedemodulated broadcast signal; and decoding the broadcast service data inthe demodulated broadcast signal.
 6. The method of claim 5, wherein theSGDU is received in a Layered Coding Transport (LCT) method of aunidirectional transport protocol.
 7. The method of claim 5, furthercomprising: accessing the SGDD based on the first signaling informationand the second signaling information; and acquiring the service guidedata in the SGDU based on the accessed SGDD.
 8. The method of claim 7,wherein the acquired service guide data are at least stored in a storageunit or displayed on a screen.